Electric heated catalyst failure diagnostic device

Details Electric heated catalyst failure diagnostic device Electric heated catalyst failure diagnostic device

2007-10-23

2007-10-23

Denion, Thomas (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

Having sensor or indicator of malfunction, unsafeness, or...

C060S300000, C060S303000

Reexamination Certificate

active

11140950

ABSTRACT:
It is an object to provide an electric heated catalyst failure diagnostic device that is compact, lightweight, inexpensive, and can accurately detect a disconnection of the heater and an abnormality in a circuit from the power supply to the heater with a simple configuration. When an ECU orders to apply the current to a heater drive circuit, a heater failure diagnostic device applies the current to the heater and the heater drive circuit. If energizing via a diode, the heater failure diagnostic device determines the circuit is abnormal. If not so, the circuit is normal. Meanwhile, when the ECU orders not to apply the current to the heater drive circuit, the heater failure diagnostic device turns on electricity to the heater and the heater drive circuit. If energizing via the diode, the heater failure diagnostic device determines the heater is not disconnected, and if not so, the heater is disconnected.

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